Lock



E, W. -NORTH May 14, 1935.

LOCK 1933 2 Sheets-Sheet 1 Filed Jan. 23

May 14, l935- E. w. NORTH 2,001,262

LOCK

Filed Jan. 23, 1933 2 Sheets-Sheet 2 Patented sewin w. North, More, ni.,-

National Lock Co., msword, lll., acomoraon oi Delaware Application January 23, 1933, 11

shackle lock an improved locking mechanism of a type having a snap-latching action and permutation controlled to eect release of the shackle-retaining-means; to provide such a locking mechanism which in the released condition will maintain such a relation of parts as to prevent aidental lcclring action of the mechanism while the shackle is withdrawn from the lock housing, thus obviating any necessity to work the lock combination in order to permit locking the shackle; to provide a mechanism of the character stated which will automatically lock when the shackle is inserted in position to be locked, thus avoiding the possibility of accidentally leav ins the mechanism in releasable condition; to provide in conjunction with such mechanism keycontrolled inea-ns for establishing a release condition, whereby locks embodying the invention and used as school locker locks may be under the control ci the school authorities through the aid of a master hey for releasing the locks in order to obtain inspection of lockers; to provide struetural improvements certain of which are of spe cial applicability to permutation or to combined key and rrnutation locks and others oi more gener-ai applicability; and in general 'to provide an improved permutation pad loch, and a conibined hey-controlled and permutation-controlled 'pad lock, o/e, highly practical, serviceable and reliable character, well adapted for the purposes of a school locker loch.

' of the locking mechanism including a locking dog for engaging the shackleand a hey-.operable carrier for said dog, the parte heini` shown in shackle releasing position. Y

Fig. 3 is a sectional view taken longitudinally of the axis oi the key barrel.

Fig. 4 is a view similar to Fig. 2 with the shackle in loci-:ed position.

Figs. 5 and 6 are detail views of certain 'spacer plates. j l

Fig. 7 is a detail view ox" the 'dial operating knob.

' rig. s is s key forlreiessing the 10er. Fis. 9 is a view looking into the lock housing (Gl. 'I6-113).

and showing a. pm of the disk tummelmecha.- nism by which the shackle-engaging dog is normally locked in shackle-engaging position, this view showing parts.

Fig. l0 is a view similar to Fig. 9 showing the parts in relation to release the shackle-engaging dog'. Y

Fig. ll is a similar view showing the shackle withdrawn from its locked position in the lock housing and the shackle-engaging dog displaced to its released position.

12 is an abutment ring associated with the tumbler disk shown in Fig. i4.

Fig. 13 is the disk tumbler which is directly operable by the dialing means.

Fig. 14 is one of the other disk tumblers.

Fig. l5 is a key tumbler.

Fig. i6 is a perspective view of the shackleengaging locking dog and its hey-operable carrier'.

Fig. l'l is a front plate having a sleeve on which the loose disk tumblers are mounted and in which the hey barrel is journall''ed.

Fig. 1B is the front housing member.

Fig. 19 is a hanged plate fitted and secured in the rear housing member.

Fig. 20 is a detail fragmentary view showing the position of the' loose dish tumblers at the instant when in the shackle-locking operation the km!! dos s from engagement with said disk tuinblers.

Referring to the drawings, the specific con'- struction embodied in the illustrative lock is described as follows:

The lock ckle i is represented as a sliding dog can be displaced'rin the shackle notch by 4 pulling out the shackle to the released position shown in Fig. 1i. As the shackle is returned to the locked vposition it encounters and actuates a lever arm Ei extending from the locking dog. thereby rocking the dos into engagement with the shackle notch. A double act spring t resists initial movement of thelocg dos in either direction but actuates the dos tc snap into the4 position toward which it is started. This spring as shown in s. 2, d and 16 may comprise a the normal locked relation of the stressed resilient device acting between the locking dog and an abutment provided by'the lug 1, said spring device having its ends pivotally seated in V-shaped notches in the dog and abutment,v

and the arrangement being such that the reaction of the spring is exerted against the dog at one side of its pivot 4 when the dog is in shackleretaining position and at the other side of said pivot when the dog is thrown out of the` shackle notch; or in other words the spring must be forced under stress past a dead center position relative* to the dog pivot I in moving the locking dog from one position to the other. The movement of the dog in the shackle-engaging direction is limited by abutment of the lever arm 5 against the lug l, and the movement of the dog in the opposite direction is limited by the stud 8. From the foregoing it will` be seen that the double acting spring 6 causes a snap action of the locking dog in moving to or from shackleengaging position, and yieldingly holds the dog in the position to which it is thrown; so that the releasing of the shackle requires pulling it outward against an initial spring resistance, while the replacement of the shacklerequires pushing it inward against a like resistance, with an ax:- companying desirable snap-latching action as soon as the resistance is overcome.

By arranging the locking dog behind the disk tumblers and providing the dog with a lateral lug 9 overlying the peripheries of the disk tumblers, which coact with said lug to lock the dog in shackle-engaging position, an advantageous compactness is obtained, permitting the lock to be manufactured in the comparatively small sizes desired for school locker locks.

The disk tumblers I0, II, I2, otherwise referred to as permutation disks, are elements of a ,well

known type of permutation mechanism including a dialing means the rotary member of which is operatively connected with one of the disks; the other disks being independently rotatably mounted and each of the disks having a shoulder or projection in the path of rotation of a shoulder or projection on the adjacent disk, so that by a predetermined manipulation of the rota'ry dialing member, for working the combination for which the lock is set, the disks are brought to a relationship to release the dog. Such release is effected by registration of peripheral recesses in the several disks with each other in the position shown in Fig. 10, so as to allow entry ofthe lug 9 into the said recesses of the disks and consequent release movement of the locking dog as shown in Fig. 1l.

Dialing means is provided as shown in Figs. 1 and 3 by a rotary dial plate I3 mounted on the front of thelock housing, operable by the knob I5, and a fixed pointer I4 shown in Fig. 1 as a notch in the front face of the lock housing. The dial knob I5, which is rotatably mounted on a iixed sleeve I6, has a reduced extension which passes through the front wall of the lock housing and carries the permutation disk I0, which is fast on the inner end of said extension( The other two disks II `and I2 are rotatably mounted on said sleeve I 6, with interposed Vnon-rotatable spacing washers I1 keyed on said sleeve.

The disk I0 which is attached to and directly operated by the dial knob, is separately shown in Fig. 13. Its recess to receive the dog lug 9 is indicated at I. This disk, which is very slightly or almost imperceptibly largerthan the others, also has a series of false recesses I 0b to coactwith the dog lug soas to foil any attempt on the part of unauthorized'persons to learn the lock combination. The projection on the disk I2 for picking up the next disk is indicated in dotted lines at I 0c.

Fig. 14 shows the next disk II, having a recess I Ia to receive the dog lug 9 and a peripheral notch I Ib for a function presently to be described. This is a thin flat disk having an annular series of holes, and is associated with the adjustable abutment ring II shown in Fig. 12. This abutment ring II has an arm providing an abutment IId and a bent terminal finger IIe to enter and project through one of the holes in the disk I I. Said disk II and the abutment Ilc with which it is equipped may be considered as a unit, the abutment ring providing at one side the abutment I Id in the path of the projection IIJc of the first disk f and at the other side the projection IIe to pick up the third disk I2, which is similar to II and equipped with a similar abutment ring I2c as shown in Fig. 3.

The described construction of the permutation disks is exemplary of one appropriate construction of disks adapted for manufacture as sheet metal stampings and suitable for compact as semblage in a small lock construction and of such character as to permit different .working combinations for different locks of the same construc' tion, the combination depending -upon the angular relation of the abutment rings`l Ic and I2c and u ,nations may be further multiplied by the use in different locks of rst disks I0 having their lugs IIJc at different angular relations to the recess I0.

It will be understood that by rotating the dial knob in opposite directions, asv required to work the particular combination for the particular lock,

the several disks will be adjusted with their pe.

ripheral recessesin registration in the position shown in Fig. 10; the third disk having first been `set by rotating the dial as required to cause the first disk to pick up the second and the second to pick up the third and bring it to said position shown in Fig. 10, corresponding to registration of' a specific dial division with the pointer; the sec- -ond disk having next been set by a reverse rotation of the dial to cause the iirst disk to again pick up the second and bring it to the vsame position, corresponding Ato registrationjof another dial division with the pointer; and the rst disk having last been set by a rotation of the dial in the first direction to bring it to the same position corresponding to registration of a third dial division with the pointer.

Having thus worked the lock combination to bring the disks to the position shown in Fig. 10, the sliding shackle may be pulled out to withdraw its short arm from the lock housing, the locking dog being forced to the released position shown in Fig. 1K1 first by the up-pull o f the shackle against the nose of the dog and then by the action of the double acting spring 6. Since the spring holds the locking dog in the position shown in Fig. 11, with the lug 9 in the peripheral recesses of the three disks, it is obvious that there can be no derangement of the lock mechanism while the shackle is in released position such as to necessikey post and turned in a clockwise direction will displace the key tumblers to a position to permit entry of the stump 32 intov the tumbler slots 35, thus releasing the locking dog carrier plate 2|, and by the continued turning of the key its bit engaging in the slotted part 30 of the carrier plate' will actuate it to the unlocking position shown in Fig. 2. As already explained this releases the locking dog 3 from the locking action of the disk tumblers by the shifting of the dog into a position with its lug 9 away from the disk tumblers. whereupon the shackle may be pulled outward to released position, shown in Fig. 2;

To relock the shackle after the key-unlocking operation, the shackle is pressed back against the lever arm 5 of the locking dog, with accompanying reverse turning of the key to restore the dog carrier plate 2l to its normal locked position, thus restoring the locking dog to its normal shackle-locking position under permutation control.

Sumrnarizing brieiiy, the shackle can be released and pulled out upon performing the 1required dialing operation to work the `lock combination, thereby adjusting the disk tumblers in position to release the locking dog. In pulling out the shackle it displaces the dog which under the action of its spring snaps free of the shackle. While the shackle is released the spring-held dog is maintained in xed relation with the dial knob and disk tumblers, preventing such a misadjustment as to necessitate redialing for relooking. To relock the shackle it is only necessary to force it back into position for locking it, in which movement its actuation of the lever arm of the locking dog initiates a return movement o the dog which then under the impulse of its spring snaps into shackleTengaging position. This operation is accompanied by an automatic setting of the tumbler disks to break the lock combination and establish a locked condition auch as to necessitate redialing for subsequent un locking. But by means of the key, the normally fixed carrier plate al can be released and actuated to change the position of the 'locking dog relative to the disk tumblers sufficiently to allow releasing action of the dog and consequently to permit the withdrawal of the shackle with such accompanying releasing action. And by forcing back the shackle with an accompanying reverse turn of the key, the parts are restored to the vnormal locked condition, whereupon the key may be withdrawn and the lock left for use as a permutation lock.

Certain constructional features of the illustrative lock will now be described.

and fastened by the rivet EL This liner plate,v

formed with the bearing on the key post and with the pivot pin 23 for the key-tumblers, is virtually a part of the lock housing but is made as a separate part for manufacturing convenience.

It has the further advantage of reinforcing and stiuening the sheet metal lock housing. A parti v,in asembly.

tion plate d2 carryingthe key-barrel or sleeve I6 is fitted-in the lock housing between the hanged liner plate 40 and ianged front plate 31. 'The locking dog carrier plate 2l and locking dog 3 and the key-tumblers 3| are arranged in the rear housing member between the plates 40 and o2, with suitable spacer plate elements 63 and M between said parts and the partition plate 42 as shown in Fig, 3. These spacer elements, shown partition plate having the key-barrel or sleeve I6, assembled with the disk tumblers H and I2, is put into place, slipping the key-barrel over the key post. Then the iianged front plate 3l hav-` ingthe dial plate, dial knob and first permutation disk` i0 assembled therewith as a unit as clearly shown in Fig. 3, is liitted in the rear housing member against the partition plate $2 and secured by spinning the outer' housing rim at 33, thus securing all the parts of the lock in assembly.

The liner plate t0 and partition plate 52 are formed with cooperating recessed flanges d5, 3% to provide a guide for the reduced swiveled end l oi the long shank of the shackle, the said reduced part of the shackle shank being formed with shoulders at each end to limit the sliding movement of the shackle in arid out, as is apparent. The housing is provided with the usual openings for the shackle, and as shown in Figs. 17 to 19 the parts do, Il@ and 3l are formed with suitable cut-away portions to accommodate movable parts of the look mechanism.

.as shown in Fig. 3. the dial plate i3 is :trusto- A conical, providing an enclosed space between it and the :iront plate of the lock housing. In this space is a Clicker ring d8 axed to the dial knob extension ibs and having a rib which rides on the annular toothed surface lli? on the front heusing plate, producing a click every time the dial is turned one notch. The clicker ring is yieidingly pressed against the front housing plate by an undulating or wavy sheet metal ring P3233. The dial plate i3, clicker ring It and first permutation disk l@ are all tted to the dial knob extension 35B and keyed therewith by means lof internal lugs on said parts engaging the longitudinal slots in said knob extension. This dial knob extension is of stepped diameter, providing seats on which the dial and clicker ring, front housing plate and rst permutation disk are respectively itted, and the inner end of said extension is swaged to the disk lll, whereby the parts mentioned are secured It will be understood that the specific construction embodied in the illustrative lock is exemplary, that changes in details of construction and arrangement are permissible, and that parts oi the invention may be variously used without the whole, so that the foregoing description is. not to be taken as limiting the invention otherwise than as dened by its claims.

The member hereinbefore designated as the locmng dog may otherwise be termed a lock bolt,

it being the movable member which directwonblers accompanyingV retraction of said lock bolt gages the shackle and by which the shackle is locked by the mechanism controlling said member.

What I claim as my invention, and desire to secure by'Letters Patent, is:

1. In a shackle lock, a shackle-locking mechanism including a pivoted locking dog engageable with the shackle, disk tumblers for locking said dog in shackle-locking position and adapted to be manipulated to release the dog, said dog when released being displaceable by withdrawal of the shackle, double-acting spring means arranged to hold the dog either in shackle-engaging position or retracted position, said spring means adapted when the dog is moved from either position a sufcient distance to overcome its resistance to actuate the dog to snap into the other position, and means operable by insertion of the shackle to cause the operation of the dog to engage the shackle.

engage the shackle when inserted, disk tumblers for locking said dog in shackle-engaging position and adapted to be manipulated to release the dog, said dog when released being displaceable by withdrawal of the shackle, the tumblers having means engaged by the dog whereby movement of the dog to and from released position causes a rotation of the tumblers, spring `pressed means having cam means bearing against certainoi said tumbler-s, the latter having cam surfaces which when the dog moves to shackle-engaging position are brought to a position such that said cam means bears thereon and shifts the tumblers having such cam surfaces to a position to cause the locking of the dog.

3. A permutation lock having a movable lock bolt and permutation disks'cooperable therewith to lock said member in a protracted position, said disks having Krecesses adapted when brought into registration with'a Dart of said lock bolt to admit said part accompanying a retracting movement of said lock bolt, said lock bolt in moving to and from retracted position adapted to turn the set of disks by coaction of said part with walls of said recesses, at least one of said disks being normally held in position to prevent retracting movement of said lock bolt, and a spring pressed pawl having ,a cam-shaped part .engaging 'a correspondingly shaped notch in said disk whereby it is normally so held; the arrangement being such that in the adiustment of said dislm to release said lock bolt the pawl rides out of said notch, and in the move- A ment of said lock bolt to its retracted position the said notched disk is turned to its normal position, and in the protracting movement of said lock bolt said notched disk is so displaced from its normal position vthat the pawl rides up a wall of the notch but not clear out of the notch, with the result that when said disk is freed from engagement with said lock bolt'the pawl will exert a camming action causing a return of said disk to its normal position.

4. A lock having a lock bolt, disk tumblers normally locking the same land manipulatable to release the same, said tumblers and lock bolt having coactive parts whereby saidtumblers are rotated by said lock bolt as it moves to and from retracted position, certain of said tumblers having cam surfaces, and spring-pressed comming means cooperable with saidsurfaces, said cam surfaces being so located ,in relation to the tumbler parts with which said lock bolt coacts as to cause'rotation of the tumbler-s, that the rotation of the tumbrings said surfaces into'a normal position 4engaged by said spring-pressed camming means, while the reverse rotation accompanying movement of said lock bolt from retracted position shifts said surfaces from normal position but not out ofv engagement with said camming means, whereupon the coaction of said camming means with said surfaces causes a rotation of the tumblers having such'surfaces to normal position for locking said lock bolt.

5. In a shackle lock, a shackle-locking mechanism including a pivoted locking-dog engageable with the shackle, a means to cause a snap action of the dog to engage the shackle when the shackle is inserted, disk tumblers cooperable with the dog to lock the same in shackle-engaging position, means to cause such cooperation of the tumblers with the dog, means manipulatable by a predetermined combination of manual operations to adjust said tumblers to establish a release lcondition oi the mechanism, andkey-operable means carrying said dog by which the dog can be moved relative to the tumblers in a manner establishing a release condition. Y

6. In a shackle lock, a shackle-locking mechanism including a pivoted locking dog engageable with thel shackle, disk tumblers for locking .said

dog in shackle-engaging position and adapted to be manipulated to release the dog, key-controlled means carrying said dog and operable to shift the pivot of the dog in a direction to tilt the dog to a position in which it is released from the locking action of thetumblers, said dog when released in either manner being displaceable by withdrawal of' the shackle, the dog being re-engageable withthe shackle upon reinsertion of the shackle.

7. In a shackle lock, a shackle-locking mechanism including a pivoted locking dog engageable with the shackle, disk tumblers for locking said dog in shackle-engaging position and adapted to be manipulated to release the dog, means oper-` able by insertion of the shackle to cause the operation of the dog to engage the shackle, a keyoperable means to which the dog is pivoted operable to tilt the dog in amanner to release it from the locking action of said tumblers by shifting the pivot of the dog, and key-tumblers normally locking said key-operable means.

8. A combined key and permutation lock having a key-operable pivoted'carrier, key-controlled` tumblers by which the carrier is normally locked in one position, a lock bolt pivoted to said carrier, disk tumblers cooperable with said lock bolt to lock the same when said carrier is in its said locked position, the movement of said carrier from said locked position swinging the pivot oi' the lock bolt in a directionto release said lock bolt from the locking action of said disk tumblers.

9. A. permutation lock havingI a lock housing,60

which comprises a` rear cup-shaped housing member of sheet metal and a flanged sheet metal 4 front plate fitted therein, a partition p1ate,flxed in said housing having a sleeve extending through the front plate, a dialing means having an oper- 10, A permutation lock having a lock housing, disk tumblers therein, a rotary dial plate on the front of the housing, an operating knob therefor, a click ring arranged between vsaicll dial plate and front wall of the housing,:said knob having a stepped slotted extension, the dial plate, click ring, front wall 'of the housing'and first disk tumbler being mounted on said stepped extension and keyed therewith by internal lugs of said parts engaging the slots of'said extension, and the inner end of said extension being swaged to the iirst disk tumbler whereby the parts are secured in assembly.

11. In a shackle lock, a shackle locking mechanism including a pivoted locking dog adapted to engage the shackle when inserted, disk tumblers for locking said dog in shackle-engaging position, said dog having an index member and said tumblers-having recesses adapted to be registered with said index member to release the dog, said dog when released being displaceable by withdrawal of the shackle, said index member movinginto and out of said recesses as the dog moves to and from releasing position-the proportions of said recesses and index member being such that the movement of the dog to and from released position causes a rotation of said tumblers, and spring-pressed cam means engaging certain of said tumblers, the latter having cam surfaces which when the dog moves to shackle-engaging position are brought toa position such that said cam means bears thereon and shifts the tumblers having such cam\surfaces*to a position to cause the locking of the dog.

12. In a shackle lock, a shackle locking mechanism including a pivoted locking dog engageable with the shackle, means to cause a snap action of the dog to engage the shackle when the shackle is inserted, disk tumblers cooperable with said dog to lock the same in shackle-engaging position, the dog when released from the locking action of said tumblers b'eing displaceable by withdrawal of the shackle, permutation controlled means for adjusting said disk tumblers to release the dog, and key-operable means for'shifting the pivot of the dog while in engagement with the shackle sulciently to move the dog clear of the disk tumblers and thereby release it from the locking action'of said tumblers.

13. In a -shackle lock, a shackle-locking mechyanismfincludingV a pivoted locking dog engageable position and adapted to be adjusted to release the dog for retraction, and`key-operable means for shifting the pivot of the dog while in engagement lwith the shackle sui'ilcientiy to move the dog clear of said tumblers and thereby release it for retraction. K

. 14. In a shackle lock, a shackle-locking mechanism comprising a swinging lock bolt operable to move into shackle-retaining position by insertion of the shackle and to be displaced from such position by withdrawal of the shackle when the mechanism is in a release condition, disk tumblers for holding 'said 'lock' bolt in shackleretaining position,-permutation controlled means for adjusting said tumblers to establish a release condition of the mechanism, and key-operable means for independently establishing a release condition comprising a carrier to which the lock bolt is pivoted arranged to shift the lock bolt pivot sufiiciently to free the lock bolt from cooperative relation with the disk tumblers.

15. A combined key and permutation lock comprising disk tumblers, a pivoted lock bolt, a keyoperable rocker to which the lock bolt is pivoted,

, and key-controlled tumbler means normally holding said rocker in such position that the disk tumblers can lock'the lock bolt in'its locking .lock bolt to lock the same in shackle engaging position and adapted to be adjusted to release said lock bolt, said lock bolt when so released being displaceable from shackle-engaging position by manipulation of the shackle, said lock bolt having a part cooperating with the tumblers to cause rotative movement of the tumblers as the lock bolt moves to and from shackle-engaging position, and spring pressed cam means engaging certain of said tumblers, the latter having cam surfaces which when the lock bolt moves to shackle-engaging position are brought to a p0- sition such that said cam means bears thereon and shifts the tumblers having such cam surfaces to a position to cause the locking of the lock bolt.

17. In a shackle lock, a shackle locking mechanism comprising a lock bolt cooperable with the shackle, a disk tumbler cooperable with said lock bolt to lock the same in shackle latching position, said tumbler having a recess adapted to `be -adjusted to position to receive a part of said lock bolt whereby to permit a release movement of said lock bolt, said part and walls of said recess coact-ing in the movement of said lock bolt to ,and from shackle engaging position to cause a rotative movement of said tumbler. a spring pressed cam means engaging said tumbler, and a camsurface on said tumbler which' on the movement thereof accompanying movement of said lock bolt to shackle-engaging position is brought to a position such that said cam means bears thereon and shifts the tumbler to position to cause locking of said latch means.

18. In a shackle lock, a shackle locking mechanism comprising a lock bolt operable to move into shackle-retaining positionfby insertion of Athe shackle and to be displaced from such position by withdrawal of the shackle when a release condition of the mechanism is established, disk tumblers for holding said lock bolt Iln shackleretaining position. permutation controlled means for adjusting said tumblers to establish said release condition, a tumbler having means cooperable with a part of said member whereby to cause a rotative movement of the tumbler as said lock bolt moves to and from shackleretaining position, a spring pressed cam means engaging said tumbler, and a cam surface on said tumbler which in the movement thereof accompanying movement of said lock bolt to shackle-retaining position is brought to such a position that said cam means bears thereon and shifts ysaid tumbler to position to cause locking of said lock boit.

19. A lock mechanism comprising a lock bolt adapted to be protracted and retracted. disk tumblers cooperable therewith to lock the same in protracted position, said disk tumblers having recesses adapted to be registered in a position to receive a part of said lock bolt so as to permit retractive movement thereof, permutation controlled means for adjusting said tumblers to effect such registry, said part and walls of said recesses coacting to cause a rotative movement of said tumblers accompanying the protraction and retraction of said lock bolt, and spring pressed cam means engaging certain of said tumblers,

the latter having cam surfaces which when thel lock bolt moves to protracted position is brought to such a position that said cam means bears thereon and shifts the tumblers'having such cam surfaces to a position to cause locking of the lock bolt.

20. A lock mechanism comprising a lock bolt adapted to be protracted and retracted, disk'tumblers for holding said lock bolt in protracted position, permutation controlled means for adjusting said -tumblers to release the lock bolt for retraction, said lock bolt and a tumbler. having coactive means whereby to cause a rotative movement of said tumbler accompanying protraction and retraction of said lock bolt, a spring pressed cam means engaging said tumbler, and a cam surface on said tumbler which in the movement thereof accompanying protraction ofthe lock bolt is-brought to such a position that said cam means bears thereon and shifts said' tumbler to a position to cause locking of said lock bolt.

21. A lock mechanism comprising a lock bolt, a disk tumbler cooper-able therewith to lock the same in protracted position and adjustable to position to release the same, said tumbler having a recess to be entered by a part of said lock bolt when retracted, said part and walls of said recess coacting to -cause a rotative movement of the tumbler accompanying protraction and retraction of the lock bolt, a spring pressed cam means engaging said tumbler, and a cam surface on said tumbler which in the movement thereof accompanying protraction of the lock bolt is brought to such a position that the said cam means bears thereon Aand shifts the tumbler to a position to cause locking of said lock bolt.

` 22. In a shackle lock, a shackle locking mechanism including a pivoted locking dog engageabley with the shackle, disk tumblers cooperable with said dog to lock the same in shackle-engaging position, the dog when released from the locking action of said tumblers being displaceable b y withdrawal of the shackle, permutation controlled means for adjusting said disk tumblers to release the dog; and key-operable means for shifting the pivot of the dog while in engagement with the shackle sufficiently to move the dog clear of the disk tumblers and thereby release it from the locking action of said tumblers.

23. In a shackle lock, a shackle locking mechanism including a pivoted locking dog engageable with thel shackle, means to cause a snap action of the dog to engage the shackle when the shackle is inserted, disk tumblers cooperable with said dog to lock `the same in shackle-engaging position, the dog when released from the locking action of said tumblers being displaceable by withdrawal of the shackle, permutation controlled means for adjusting said disk tumblers to release the dog, and key-operable means for shifting the pivot of the dog while in engagement with the shackle sufiiciently to move the dog clear of the disk tumblers and thereby release it from the locking action of said tumblers, said means to cause a snap action comprising a spring which resists displacement of the dog from shackle-engaging position whether the dog is released from locking'action of the tumblers by adjustment of said tumblers by the permutation controlled means or by operation of said key-operable means.

24. In a shackle lock, a shackle locking mechanism including a pivoted.' locking dog engageable with the shackle, means to cause a snap action of the dog to engage the shackle when the shackle is inserted, disk tumblers cooperable with said dog to lock the same in shackle-engaging position, the dog when released from thelocking action of said tumblers being displaceable by withdrawal of the shackle, permutation controlled means for adjusting said disk tumblerswto release the dog, and key-operable means for shifting the pivot of the dog while in engagement with the shackle suiiiciently to move the dog clear of the ,disk tumblers and thereby release it .ofthe vdog to engage the shackle when the' f shackle is inserted, disk tumblers cooperable with .said vdog to lock the same in shackle-engaging position, the dog when released from the locking action of said tumblers being displaceable by Withdrawal of the shackle, permutation controlled means for adjusting lsaid disk tumblers to release the dog, and key-operable means for shifting the pivot of the dog while in engagement with the shackle sufficiently to move the dog clear of the disk tumblers and thereby release it from the locking action of said tumblers, said key-operable means comprising a carrier having said pivoted dog and means to cause a. snap action mounted thereon. l

26. In a shackle lock, a shackle locking mechanism comprising a lock bolt operable to move i into shackle-engaging position by insertion of the shackle and to be displaced from such position by withdrawal of the shackle when the mechanism is in a. release condition, disktumblers for holding said look bolt in shackle-engaging position, permutation controlled means for adjusting said tumblers to establish a release condition of the mechanism, and key-controlledA means for independently establishing a release condition comprising a carrier having said luck bolt movably mounted thereon, said carrier being key-operable to shift the lock bolt whilrl in engagement with the shackle sufliciently relative to the tumblers to free the lock bolt from.the

condition of the mechanism, and key-controlled means for independently establishing a release conditioncomprising a `pivoted carrier having said lock bolt movably mounted thereon, said carrier being key-operable to shift the lock' bolt while in engagement with the shackle sufilciently relative to the tumblers to free the lock bolt from the locking action of the tumblers.

EDWIN W. NORTH. 

